source: MondoRescue/branches/2.2.5/mindi-busybox/util-linux/mkswap.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 13 years ago

Update to busybox 1.7.2

File size: 1.1 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* mkswap.c - format swap device (Linux v1 only)
3 *
4 * Copyright 2006 Rob Landley <rob@landley.net>
5 *
6 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
7 */
8
9#include "libbb.h"
10
11int mkswap_main(int argc, char **argv);
12int mkswap_main(int argc, char **argv)
13{
14    int fd, pagesize;
15    off_t len;
16    unsigned int hdr[129];
17
18    // No options supported.
19
20    if (argc != 2) bb_show_usage();
21
22    // Figure out how big the device is and announce our intentions.
23
24    fd = xopen(argv[1], O_RDWR);
25    len = fdlength(fd);
26    pagesize = getpagesize();
27    printf("Setting up swapspace version 1, size = %"OFF_FMT"d bytes\n",
28            len - pagesize);
29
30    // Make a header.
31
32    memset(hdr, 0, sizeof(hdr));
33    hdr[0] = 1;
34    hdr[1] = (len / pagesize) - 1;
35
36    // Write the header.  Sync to disk because some kernel versions check
37    // signature on disk (not in cache) during swapon.
38
39    xlseek(fd, 1024, SEEK_SET);
40    xwrite(fd, hdr, sizeof(hdr));
41    xlseek(fd, pagesize-10, SEEK_SET);
42    xwrite(fd, "SWAPSPACE2", 10);
43    fsync(fd);
44
45    if (ENABLE_FEATURE_CLEAN_UP) close(fd);
46
47    return 0;
48}
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